I've attached the questionnaire below which outlines the details we are after. Something for Adrain to ponder upon. As you can see it is rather intense.

Not sure about Jon's register..... haven't seen it. He asked for someone to take over and I volunteered.

Cheers, Hugo.

BRITISH SEAGULL SD RANGE REGISTER QUESTIONNAIRE

Thank you for providing us with the information so we can ascertain historical information on these motors. If you can email the information back to britishseagullsd@gmail.com it would be most appreciated. All personal details will be kept confidential and location of motors will only be publicised as Country, County/State/Province. For ease copy and paste this questionnaire into an email.
The information that we would like are as below. If you have photos, that would be great. A shot of both sides and the top plus the engine number please. Not to worry if that is difficult.
Engine number, ie SD.125.P3. Plus second crankcase # on tiller side (early SD’s)
Magneto number. The number can be found under the flywheel cover and on the magneto baseplate ie JM 7208
Skeg stamp. This is the C.I.E.S.S. round stamp on gearbox skeg.
Nipples on gearbox , tiller side or carb side.
Flywheel cover. Copper or Aluminium.
Bayonet petrol cap finish. Brass or Chrome.
Tank saddles. Cast aluminium or pressed brass/steel.
Clutch Lever. Brass/Bronze or aluminium.
Patent Inscription on Clutch lever, Yes or No.
Amal 46A 3A carburettor. Brass body or Aluminium.
Carburettor float chamber top. Brass or Aluminium.
Flywheel nut. Brass or brass chromed.
Flywheel nut top. The hex nut has no lighthouse top and measures .82" face to face. The later ones may have a Standard Seagull nut with the lighthouse top.
Fuel Tap. Brass or Chrome.
Amal throttle lever. Brass or Chrome plated.
Exhaust tube. Plain Brass or Chrome plated.
Tank Decal: Seagull on the tank. Y or N.
Driveshaft. Short or long. They came as standard long but many have been cut down.
Location. Country of motor. Your phone number and email address would be appreciated, optional. MANY THANKS.